Question 85Motor Plants - Assistant Engineer

You are correct, the answer is D) ignite the fuel. The main objective in the starting process of a diesel engine is to attain the compression conditions sufficient to ignite the fuel. Diesel engines rely on the compression of air to generate the high temperatures needed to ignite the injected fuel. By compressing the air, the temperature inside the cylinder increases to the point where the injected fuel will spontaneously combust, starting the engine. The other options are incorrect because they do not directly relate to the primary purpose of the starting process, which is to create the conditions necessary for fuel ignition. Turning the flywheel, reducing friction, and overcoming inertia are all secondary effects of the starting process, but do not represent the main goal.